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libertas: convert libertas driver to use an event/cmdresp queue

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This patch (co-developed by Dan Williams and Holger Schurig) uses a kfifo
object for events and a swapping buffer scheme for the command response to
preserve the zero-copy semantics of the CF driver and keep memory usage low.
The main thread should only ever touch the buffer indexed by priv->resp_idx,
while the interface code is free to write to the second buffer, then swap
priv->resp_idx under the driver spinlock.  The firmware specs only permit
one in-flight command, so there will only ever be one command response to
process at a time.

Signed-off-by: Holger Schurig <hs4233@mail.mn-solutions.de>
Signed-off-by: Dan Williams <dcbw@redhat.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Holger Schurig
2008-04-01 14:50:43 +02:00
committed by John W. Linville
parent 98dd6a5759
commit 7919b89c82
13 changed files with 270 additions and 384 deletions
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27
drivers/net/wireless/libertas/dev.h
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@@ -129,10 +129,6 @@ struct lbs_private {
u32 bbp_offset;
u32 rf_offset;
/** Upload length */
u32 upld_len;
/* Upload buffer */
u8 upld_buf[LBS_UPLD_SIZE];
/* Download sent:
bit0 1/0=data_sent/data_tx_done,
bit1 1/0=cmd_sent/cmd_tx_done,
@@ -155,21 +151,16 @@ struct lbs_private {
/** Hardware access */
int (*hw_host_to_card) (struct lbs_private *priv, u8 type, u8 *payload, u16 nb);
int (*hw_get_int_status) (struct lbs_private *priv, u8 *);
int (*hw_read_event_cause) (struct lbs_private *);
/* Wake On LAN */
uint32_t wol_criteria;
uint8_t wol_gpio;
uint8_t wol_gap;
/* was struct lbs_adapter from here... */
/** Wlan adapter data structure*/
/** STATUS variables */
u32 fwrelease;
u32 fwcapinfo;
/* protected with big lock */
struct mutex lock;
@@ -181,7 +172,6 @@ struct lbs_private {
/** command-related variables */
u16 seqnum;
/* protected by big lock */
struct cmd_ctrl_node *cmd_array;
/** Current command */
@@ -194,12 +184,17 @@ struct lbs_private {
struct list_head cmdpendingq;
wait_queue_head_t cmd_pending;
/* command related variables protected by priv->driver_lock */
/** Async and Sync Event variables */
u32 intcounter;
u32 eventcause;
u8 nodename[16]; /* nickname */
/* Command responses sent from the hardware to the driver */
u8 resp_idx;
u8 resp_buf[2][LBS_UPLD_SIZE];
u32 resp_len[2];
/* Events sent from hardware to driver */
struct kfifo *event_fifo;
/* nickname */
u8 nodename[16];
/** spin locks */
spinlock_t driver_lock;
@@ -209,8 +204,6 @@ struct lbs_private {
int nr_retries;
int cmd_timed_out;
u8 hisregcpy;
/** current ssid/bssid related parameters*/
struct current_bss_params curbssparams;